An object of the present invention is to provide means for enhancing ability to solubilize a low water-soluble substance or to disperse the substance in water. The present invention provides a water-containing composition containing water; at least one polyoxyethylene-polyoxypropylene-added phytosterol or phytostanol represented by the following formula (1): [wherein R represents a phytosterol residue or a phytostanol residue; m is a number from 5 to 100; and n is a number from 5 to 100]; and at least one low water-soluble substance which is in a dissolved state.